TEXT mpvecsub(SB),$0
       MOVW    alen+4(FP), R4
       MOVW    b+8(FP), R5
       MOVW    blen+12(FP), R6
       MOVW    diff+16(FP), R7
       MOVW    $0, R8
       MOVW    R8, R3
       CMP     R8, R6
       B.EQ    _sub1
       SUB     R6, R4, R4
_subloop1:
       MOVW.P  4(R0), R1
       MOVW.P  4(R5), R2
       CMP     R3, R8
       SBC.S   R2, R1
       SBC     R8, R8, R3
       MOVW.P  R1, 4(R7)
       SUB.S   $1, R6
       B.NE    _subloop1
_sub1:
       CMP     R8, R4
       RET.EQ
_subloop2:
       MOVW.P  4(R0), R1
       CMP     R3, R8
       SBC.S   R8, R1
       SBC     R8, R8, R3
       MOVW.P  R1, 4(R7)
       SUB.S   $1, R4
       B.NE    _subloop2
       RET

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